On my AR's specific kinds of mags ONLY get loaded with specific ammo. That is one of the nice things about P-mags coming in different colors also. One example is my .300 whisper only gets loaded into green 20rd mags.

On my Glock mags they have colored tape on the body, and the back plate on the slide matches that color.

I got an old EAA in 45 and a new one in 10mm. I Was at a friends shootin a bunch of guns and had the guns and mags all sitting in a deck chair, not very organized. Grabbed the 10 mm mag by mistake and popped it in the 45 , chambered right up. Shot and it fired one out in the field but the casing was jammed in there so tight I had to take it home and use a chunk of dowel to hammer it out. Nobody got hurt including the gun as far as I can tell. Got to looking at both guns and the slides and mags both interchange. Think I'll use one a those silver markers and label the side of the mags . Maybe pay more attention too

If you look closely at the top shelf you can see every mag is labeled. Really paranoid about mixing them up. Heck, I even number my 1911, AR & AK mags so if I'm having feed problems I can narrow it down to see if it is a specific magazine.

I did this once......Loaded 9mm rounds in the .40 cal CZ 75 mag, and fired it, once. 9mm wasn't powerful enough to cycle the slide. The bullet hit the target at 50', low and tumbling.

Shows how malleable brass is/can be. I was confident there was no harm to come from my mistake. 10mm in a .45, that's kind of spooky though, pretty hefty increase in pressure there. Could have a lot of fire and brass shrapnel coming back at you, and if you had a slide come apart!

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